Added the undofile() function. Updated runtime files.
diff --git a/src/proto/undo.pro b/src/proto/undo.pro
index 90e11d2..cea7d49 100644
--- a/src/proto/undo.pro
+++ b/src/proto/undo.pro
@@ -7,8 +7,9 @@
int u_savedel __ARGS((linenr_T lnum, long nlines));
int undo_allowed __ARGS((void));
void u_compute_hash __ARGS((char_u *hash));
-void u_read_undo __ARGS((char_u *name, char_u *hash));
+char_u *u_get_undo_file_name __ARGS((char_u *buf_ffname, int reading));
void u_write_undo __ARGS((char_u *name, int forceit, buf_T *buf, char_u *hash));
+void u_read_undo __ARGS((char_u *name, char_u *hash));
void u_undo __ARGS((int count));
void u_redo __ARGS((int count));
void undo_time __ARGS((long step, int sec, int absolute));